Elevator-door lock



2 Sheets-Sheet 1 Ewan??? Jizmas Eumlo Aug. 31 1926. J. DUNLOP ELEVATOR DOOR LOCK Filed August 16 1924 mmWWW:ummumunnmmmW Aug. 31 1926.

J. DUNLOP ELEVATOR DOOR LOCK 2 Sheets-Sheet 2 Filed August 16, 1924 Patented Aug. Bl, i928.

UblliEiE PATENT l Fl Q i1 JAMES DUNLOI, OF CHICAGO, ILLII'EOIS, ASSIG-IEOE T KAESTNER & HECHT COMPANY, G1 CHICAGG, ILLINOIS, CQRP JR-ATION OF ILLINOIS.

ELEVATOR-DOOR LOCK.

Application filed August 16, 1924. Serial No. 732,399.v

My invention pertains to improvements in elevator door locks, and more specifically to door loclrs automatically controlled by means on the elevator cage.

One of the objects oi my invention is to provide a novel elevator door lock llLVlllf a locking member adapted to be automatically disengaged from the door catch, but which is held in locking position when the door is closed and cannot be disengaged except upon an attempt to open the door.

A more detailed object is to provide an elevator door lock having a latch operating means which tends to move the latch out of engagement with the door catch when the cage is at the landing, but which is opposed by the mass of the door and is ineffective until an attempt to open the door is made to partially withdraw the catch, and is nice,- of retaining the latch in withdrawn position when the door is again closed.

Another object is to provide an elevator ooor lock of novel construction having a pair of switches which are connected in series in one of the control circuits of the elevator system, and are closed at the same ie only when the door is closed and latched. p

A specific object is to provide an elevator door lock having a latch adapted to be moved into and held in locking position by the door catch and to be disengaged -from d catch by an electromagnet alter or si mnl' eously with a slight withdrawal of the catch; and having a pair of switches controlling the operation of the cage, said switches being adapted to be closed respectively by the catch the latter enters the lock. and the latch as the latter engages the '"h, thereby insuring that the door is sod and locked before the cage can move rom the landing. further object is to provide a lock of the above character which can be asseml led in a n1. nber of w ys to suit the varying requirements of different elevator installations.

.i-tnother object is to provide means for preventing the switches in the door look from being injured by manual tampering when the door is. open.

Still a further object is to provide a door loci; for electric elevators which is constructed of but a small number of moving parts,

simply and compactly arranged, and which 1 sale is reliable, eiiicient, and neat in appearance.

Ancillary objects and advantages will become apparent as the description proceeds.

In the accompanying drawings, Figure l is a front view of a door lock constructed in accordance with my invention, one cover plate being removed to show the interior of the lock.

Fig. 2 is a view showing a slightly diiier ent assembly. v

Fig. 3 is a sectional View taken along line 8-3 of Fig. 1. V

Fig. 4i is a left side view of the assembly shown in Fig. 2 with the door catch removed. V

Fig-5 is a simple diagrammatic represelr tation of an electric elevator illustrating the use and operation oi the lock.

vlhile my invention is susceptible of various modifications and alternative constructions, 1 have shown in the drawings and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby intend to limitthe invention to the specific construction disclosed but aim in the appended claims to cover all forms falling within the spirit and scope of the invention. 7 p

Referring to the exemplary embodiment illustrated inthe drawings, 10 designates a suitable casing for the door lock which prett erably consists of a hollow rectangular frame 11. The opposite sides of the frame 11 are connected by two parallel spaced'webs 12, and the front and rear faces are closed by removable cover plates 13. One side of the frame 11' is formed with an opening leiadapted to receive the catch 15 on tire door 16.

While any suitable means can be employed to secure thecasing 10 t the hatchway 17,

I prefer to use bolts 18 which extend through bores 19 in the corners of the treme- 11. The cover plates 13 are similar but right and left hand in construction, and the bores 19 are beveled at both ends to permit ieversal of the casing 10 for doors 16 ooen-' ing to the right andlett.

Removably mounted onapin 20 and be tween two spaced lugs 21 extending wardly'from one side of the frame '11 is a pivotal locking member or latch having a hook 23 at its freeend adapted to engage and retain the catch'l5 when the door 16 is closed. A pair of plugs 2-1 are removably threadedinto tapped bores in the lugs 21, and support the opposite ends of the pin 20. To permit removal of the plugs, the cover plates 13 are cutaway at 26.

The rear endot the latch is formed integral with an arm 27 extending downwardly from the pivot into a position to be engaged by the forward end of the catch 15 when the door 16 is closed Upon, being thus engaged, the arm 27 will move the hook 23 into.lochingengaigement with the catch 15, and holdtlre same against upward :move ment until the, catch 15 is slightly withdrawn show'nin, Figs.;1-and2, Downward movement of the latch 22 is arrested ,by

a pair of lateral extensions 28 projectingv to ward, each other.v from the cover vplates, 13. The latch 22 can be manually raised to; release the catch 15 by means of a p n; 29; re

movably secured to either side of-the latch,

and projecting through,asuitable aperture 30 in either one of the cover plates 13, depending on, which one is exposed.-

\ Means isprovided for automatically raising the latch 22. This means may beeeither mechanically orelectrically, controlled, but Ihaveherein shown only the latter form, the merhanicaltorm beingfully disclosed and covered ;in my copending application,

, SerialNoa 732,398 filed August 16, 1924 Referring to Figs. 1 and 3, a ball or cam roller 31 i's rotatably mounted on the pivoted endot thelatc-h 22,, andisposi-tion'ed between the forked armsof a cammember 32 ad ustably mounted on aspindle, One,

end of the spindle33 is journaljed in oneside of the frame 11, theother end extends out of the casing 10 through an elongated sleeve or support 3-1 threaded into theother sideof the frame 11. A bracket 35;having a. clamp sleeve 36 is adjustably. and reversibly secured to the outer end of the spindle 33 and 1 supports a magnet arm orarmature 37 on its free end. The armature 37 is adapted to be attracted whenthe cage is at the landing by an electromagnet 38'mounted on the elevator cage 39. It will be seen that the armature 37 willraise thelatch 22 uponvv being oscillated in either direction from a 1 central position, thereby facilitating; reversal of the casing 10. Upward movement of the latch 22 is opposed by ,the mass 'otthe,

" ,attempt toopen the, latter is made, the electromagnet 38 is designed to have strength, when excited, suflicient to raise the latch 22 against its own weight but not tomove the ment of the cage 39 away from the landing when the door 16 is. open or unlatched. This meanscomprises a pair of rocker arms 10 and 411 made of insulating material and nounted between the webs 12 on pivot pins 412'. The upper end of the rocker, arm 40 is formed with a cam portion 43 adapted to be engaged and depressed by the door catch 15 asthe latter enters the casing 10. The upper end of thejarm 41 is; provided with a projection 14tfittingloosely-into a notch 45 in the lower end ofthearm27. A pair of contact strips46 are mounted on adjacent sides ot-therocker arms, and are electricale 1y connected by a ,coil spring .4 7. Removably mounted in a pair of notches 48 formed in opposite. sides of the frame 11 is an insulating board 49which supports apair or" spring contacts 50 positioned to be engaged by the contact strips 46. Undue flexing, of the spring contact- 50' beyond their elastic limit, as by a manual depressionof the cam portion43 or latch 22, is prevented by a pair of upstanding lugs 51 formed integral with the plate 4-9.

The contact strips 16 and the spring contact-s50 constitute a pair of switches52 and 53 which are connected in series and are adapted to form part of one of the elevator circuits controlling the movement of the cage 39.. 7 It will be seen that upon closing and latching the door 16 both switches will be closed, and that upon subsequently deeir ergizing the electromagnet 38 the door 16 will :be locked. hen the door is open and the latch 22 is. raised, both switches will be open; when the door is closed and the latch is raised, switch 53 will be open; and w'henvthe door is open and the latch 22 isdown, as for example, if the electromagnet 38 became defective or deenergized, switch 52 will be open to prevent in each instance a closure of the circuit through the switches.

Referring to Fig. 5,1 have shownthe lock asforming part of a simple elevator system, but is, to be. understood that itcan be connected in many other systems in any other.

suitable manner. In the present'elevat-or system, the driving motor forthe cage 39 is represented by 54, and the up and,"down directional switches for controlling the operation otithe motor by 55 and 56 respectively. Theseswitches are adapted to be actuated by, means of a car switch 57 havinga suitable control lever 58.

To actuate the switch 55, the lever 58 is moved to the left, thereby closing the fol- 66, wire 6?, switch contacts 68, wire 69,

motor armature, wire 70, switch contacts 71 and wire 72 to the minus main 65. The field 73 of the motor is connected directly across the main lines by wires 72 and 74. The speed of the motor can be varied by moving the lever 58 along the resistance 66 within the range allowed by the segmental con tact 61.

Movement of the lever 58 to the right, closes a circuit for the switch 56, as follows: from the plus main 59, through wire 60, lever 58, segmental contact 75, wire 76, coil 77, and wire 64: to the minus main. Operation of the switch 56 closes a circuit through the motor armature. reverse to the foregoing circuit closed by the switch 55, and as tollows: from the wire 60, through lever 58, resistance 66, wire .67, switch contacts 78, wire 70, motor armature, wire 69, switch contacts 79, and wire 72 to the minus main.

The switches 52 and 53 of each door lock in the hatchway are connected in series in .the wire 6%, and hence control the operation of the directional switches. Upon move ment of the lever 58 into a neutral position to stop the cage 39, a circuit through the electromagnet 38 will be closed as follows: from wire 60, lever 58, contact 80, wire 81, coil 82, and wire 6% to the minus main. It the cage 39 is now at one of the landings 83 so as to position the electromagnet 38 next to the armature 3?, the door 16 will be unlocked. Since the excitation of the electrcmagnet 38 is insufiicient to overcome the mass of the door 16, movement of the armature 37 will be suspended until the arm 2? is released by the withdrawal of the door catch 15, Further movement of the cage 89 is prevented until the door 16 is closed and latched.

It will be seen that I have provided a door lock simple in construction and operation, capable of being assembled and moun ed in diiierent ways'l or dilierent elevators, and etlicient and sale in use. While I have shown the casing 10 as secured to the hatchway, and the catch 15 to the door 16, it is contemplated that these parts can readily be reversed without aliecting the operation of the lock.

1 claim as my invention 1. An elevator door lock having, in combination, a casing, a door catch, a latch in the form of a bell crank pivotally mounted in said casin one arm of said latch being constructed to engage saidcatch andthe ether arm being positioned to be engaged by said catch to hold said first mentioned arm in locking position, saidcatch having a limited movement when latched to permit release of said last mentioned arm, and means for raising said latch when said catch is moved out of engagement with said last mentioned arm;

2. An el vator door lock having, in com- 3. An elevator door lock having, in combination, a casing, a door catch, a latch in the form of a bell crank one arm of which is provided with a hook to engage said catch andthe other arm of which is positioned to be engaged by said catch said catch having a limited movement between '1- sald hook and said last mentioned arm, an

electrical switch controlled by said catch and adapted to form part or" one of the control circuits of an electrical elevator, and means for raising said latch when said catch is partially withdrawn against said hook to release said last mentioned arm.

4;. An elevator door lock having, in combination, a casing, a door catch, a latch for engaging said catch, means for releasing said catch, a pair of rocker arms mounted in said casing to be'actuated respectively by said catch and said latch, L-PLlr of contact plates one on each rocker arm, said contact plates being electrically connected, a support in said casing, and a pair of spring con- .tacts mounted on said support to be respec tively engaged by said contact plates, said.

support comprising means for limiting the tlerure of said contact plates.

5. A lock having, in combination, a casing, a door catch, a locking member for engaging said catch, a pair of rocker arms mounted in said casing and controlled by the position 01" said catch, contact plates on said rocker arms, and a pair of contact members mounted for engagement by said con tact plates.

. 6. An elevator lock having, in combinaticn, a casing adapted to receive a door catch, a latch pivotally mounted in said casing and adapted to engage said catch, a

shaft jcurnaled in said casing and extending at one side thereof, a cam member secured to said shaft and engaging said latch to raise the latter upon rotation of said shaft in either direction, a bracket adjustably and removably clamped to the outer end of said shaft, and an armature secured at one end to the free end of said bracket for movement therewith, said armature being adapted to be attracted by an electroma net when the latter is in juxtaposition.

7. A lock having, in combination, a door 5 catch, a latch adapted to engage'said catch, -a shaft rotata'bly mounted next to said-latch, a bifurcated cam member mounted on said shaft and engaging said *latch to move the latter out of engagement with said catch upon rotation of said shaft in either direction, and means for rotating said shaft.

8. An' e-levato'r door lock having, in combination, a casing, a member positioned to enterjsaidcasi'ng, a latch in said casing for engagingsaid member, means for holding said'l-atc'h inengagement with said member effective only when the door is completely closed, means rendered 'operativewhen the cage is atthe landing for raising said latch but being ineiiect'ual to do so until said first ni'e'rition ed 'ineans is rendered inefiectual, and aw'swit'ch controlled by said first mentioned means, said switch being adapted to form part ofan elevator circuit controlling the movement ot'the cage. I

9. A door lock having, in combination, a casing, a member positioned to enter said casing, a latch for engaging said member when 'thedoor is completely closed, and'two -'switches one of which'is actuated when said memb'er enters the-casing and the other of whichris actuated wlrensaid latch engages said member.

10. Amelevator door'loclr having, in combinati'on, a casing, a door catch, aflocking member in said-casing'and 'adapted to engage said catch, releasingmeans including an armature pivotally mounted on said casing and'o'peratively connected to'said-lock- 'in'g member,'-and anLeIectromagnet mounted on the cage in a position to pass adjacent said armature andattract the latter'to disengage said locl'ring member from the catch.

11. An elevator door lock having,in combination, a casing, a door catch,-'a locking 'me'mber in said casing for engaging said catch and" constructed to beheld in locking position by the latter when the door is completely closed, and means for moving said 50 locking member to release said catch, said "means "being rendered operable when the cage'is at the landing'butbeing ineffectual to move said member except after or simultaneously with an attempt to open the door.

12. An elevator door lock having, in combination, a catch, a lockingmember mounted to engagesaid catch, means for preventing movement of said locking member out .ofengage'ment with said catch when the door is m closed, and means rendered operativewhen the cage is at the landing tending to move said locking member out of locking position, the action of said means being suspended until'sai'd'first mentioned means is rendered $5 ineffectual.

1'3. An elfe'vator door lockhavin'g, in combination, acasing, a doormatch, a latch pivotally mounted in said casing :and having a depending-arm to be engaged by said catch when the door is closed, cam means for engaging said latchto raise the -same, an armature mounted on said casing for actuating said cam means, and an electromagnet mounted on. the cage in a position to pass adjacent said armature and-to attract the latter when the cage is stationary at the lai'iding, said electromagnet"being incapable of attracting said armature until said depending arm is'released.

14. An elevator door lock having, in combination, a door catch, a -latch mounted to engage said catch and-to be held thereby from moving out of engagement therewith when the door is completely closed, and

:means rendered operable vi hen the cage is at the la'nding toraise said latch but being ineffectual-to raise said lateh until said catch is partially withdrawn.

15. A door lock having, in combination, casing, a' door catch, 'a"=l'atch1i'n said casing, rolier'on said latch, i-a' spindle, a cam mount d in:'said spindle "and i'positioned .to engz-ige said roller to raisesaid latch, and

m ans for rotating said spindle.

16. -.si'11- elevator door lock having, infcombination, a casing, a door catch, a latch for engaging saidcatch, means 'ior holding said. lat-ch inengagement with said catch when the door is completely closed, a spindle, means on said spindle operatively connected 'to said latch, andmeans for automatically rotating .said spindle when said first inentioned means is rendered ineffectual.

17. An elevatordoor lock having, in com-- bination, a casing,a door catch, a latch ':for engaging said catch, a spindle operative'ly connected to said latch, means on said latch itor holdingsaid latch in engagement with said :c'atch when the door is completely closed, and electromagnetic means rendered operable when "the'ca'ge isat the landing to rotate said spindle to disengage said latch, =saidelectromagnetic means being ineffectual to overcome said'firstmentioned meansand acting to raise said latch only when said catch has been partially withdrawn.

18. An elevatordoor lock having-fin combination, door catch, a locking member for engaging said catch, meansfor'holding said locking -member in'engagementwith said catch when the door is completely closed,

and a pair=ot switches :controlled by said catch and sa-idmeans, said switches bein'g adapted to be-connected in one of the control circuits of the elevator system.

19. An elevator door 'lock' having, incombination, a door catch, a latch-tor engaging 's'aid"catcl1,'- and a pair of switches res-pec- 't-ivcly"controlled bysaid catch and said latch, said switches beingadapted to form part of the control circuits of the elevator system.

20. An elevator door lock having, in combination, a door catch, a latch for engaging said catch, said latch having a depending arm for holding it in engagement with said catch when the door is closed, and a pair of switches respectively controlled by said catch and said arm and adapted to be connected in the elevator system.

21. An elevator door lock having, in combination, a casing, a door catch, a latch in said casing for engaging said catch and adapted to be held in engagement thereby when the door is completely closed, a switch constructed to be closed by said catch as it enters said casing, and a second switch constructed to be closed W ien said latch en- "ages said catch, said witches being adapted to be connected in the elevatorsystem to control the movement of the cage.

22. An elevator door lock having, in combination, a casing, a door catch, a locking member in said casing for engaging said catch, automatic means for disengaging said locking member when the cage is at the landing, and switch means for controlling the movement of the cage, said switch means being controlled by said catch and said look ing member.

23. An elevator door lock having, in combination, a casing, a door catch, a latch to engage said catch, electromagnetic means operable to raise said latch when the cage is at the landing and an attempt to open the door is made, and a pair vof switches connected in series and controlled by said catch and latch, said switches being adapted to form part of the elevator system to control the movement of the cage.

In testimonv whereof, I have hereunto alilXed my signature.

JAMES DUN LOP. 

